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Mechanic says the other camshaft lobes were ok and not as worn as the #3. But he doesn't think it has been caused by sticky valves or any other internal fault and says he has seen wear to only one lobe on similar Vauxhall GM engines without anything wrong which would cause it to wear more than the o...

I will ask the mechanic about the condition of the other lobes and why only #3 is stuffed. The car has done 85,000 miles so I wouldn't have thought under normal conditions to wear out so soon unless like you say there is another problem that has caused it like a sticky valve or blocked oil passage t...

Thanks for the replies guys. Mechanic has had a look and it's a worn camshaft lobe. So off with its head.

Dropped it off today but it will be around middle of next week when mechanic gets around to looking at it. Will let you know the outcome once I know. It drives much better now I've cleaned out all the pipes intake and TB, but still nothing happening in cyl #3. As there is only 3 pots firing I'm thin...

My local garage is going to have a look on Friday. If it is the valves is that a big job to fix. Does the head have to come off?

Got a couple of cans of intake cleaner and spent the day cleaning the throttle body, idle valve and all the breather & intake hoses. Was a lot of crap in there. The car runs more smoother but still not firing on #3. Thanks for the diagram I am beginning to think you are right about a valve problem. ...

Daniel wrote:No idea, mate. Just thinking. Maybe I think too much .

BTW, who is m8?

Daniel

U R M8

Please don't stop thinking as all ideas greatly appreciated. I've got a mechanic friend going to take a look later this week if I don't get it sorted.

Hi m8, as the compression is still within acceptable limits would a intake valve problem affect the compression test more?

Looks like I'm back to square one again.:( I swapped around #3 & 4 injector but unfortunately #3 is still not firing. I checked the compression again with the engine at normal temp. With the plugs removed and throttle fully open the readings are; 1 180psi 2 180psi 3 140psi 4 160psi I put a teaspoon ...

Thanks for that guys. I will swap the injectors over later today. I did check the resistance with a multimeter and they appear to be equal.

1 12.6ohms
2 12.4ohms
3 12.5ohms
4 12.2ohms

I'm hoping it is a blocked injector. Will let you know what happens. Thanks again.

Cheers man, that doesn't sound too bad. Once the fuel rail is off do the injectors simply pull out or do they unsrew? Is there any seals or O rings I need to be careful of? Thanks.

Hi m8, I tried unpluging each of the injector connections with the engine running and the same thing happens. Number 1, 2 & 4 drops the revs to nearly stall but removing #3 makes no difference. #3 sparkplug is dry (no unburnt fuel or wet oil). I did try swapping over #3 injector connection onto #4 f...

Cheers bud. Yes it looks like the compression is within the 25% range so shouldn't really affect it too much. Any idea what else could be causing #3 not to fire. If I remove the lead from the sparkplug it makes no difference to the engine when idling? I changed the plugs and tried a different lead t...

Hey guys I could do with your help please. I bought a cheap Lanos 8valve but it is not firing properly on number 3 cylinder. I checked this by pulling the leads from each sparkplug in turn as the engine was idling. The engine revs drop when I pull the leads to cylinder 1, 2, & 4 but make no differen...